Novel application of α-azido aldehydes in multicomponent reactions: synthesis of triazolo-fused dihydrooxazinones via a Passerini reaction-dipolar cycloaddition strategy.

α-Azido aldehydes can be employed in Passerini reactions with isocyanides and various propiolic acids to afford the three-component adducts in moderate to good yields. These compounds undergo a straightforward azide-alkyne dipolar cycloaddition to furnish triazolo-fused dihydrooxazinones.